کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5487795 1523722 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Post-flare formation of the accretion stream and a dip in pulse profiles of LMC X-4
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Post-flare formation of the accretion stream and a dip in pulse profiles of LMC X-4
چکیده انگلیسی
We report here a pulse profile evolution study of an accreting X-ray pulsar LMC X-4 during and after the large X-ray flares using data from the two observatories XMM-Newton and RXTE. During the flares, the pulse profiles were found to have a significant phase offset in the range of 0.2-0.5 compared to the pulse profiles immediately before or after the flare. Investigating the pulse profiles for about 105 s after the flares, it was found that it takes about 2000-4000 s for the modified accretion column to return to its normal structure and formation of an accretion stream that causes a dip in the pulse profile of LMC X-4. We have also carried out pulse phase resolved spectroscopy of LMC X-4 in narrow phase bins using data from EPIC-pn and spectroscopically confirmed the pulsating nature of the soft spectral component, having a pulse fraction and phase different from that of the power-law component.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 56, October 2017, Pages 94-101
نویسندگان
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